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Physics, 22.06.2019 15:30
Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples
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Physics, 23.06.2019 07:00
Which best offense of relationship between speed and velocity speed is velocity what displacement velocity and speed with displacement spee is based on a specific direction velocity isis based on displacement
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Physics, 23.06.2019 07:40
The researcher who studied the ability of cats to learn to escape from puzzle boxes was
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Physics, 23.06.2019 16:00
Acommon procedure for measuring the velocity of an airstream involves the insertion of an electrically heated wire (called a hot-wire anemometer) into the airflow, with the axis of the wire oriented perpendicular to the flow direction. the electrical energy dissipated in the wire is assumed to be transferred to the air by forced convection. hence, for a prescribed electrical power, the temperature of the wire depends on the convection coefficient, which, in turn, depends on the velocity of the air. consider a wire of length l = 20 mm and diameter d = 0.5 mm, for which a calibration of the form v = 6.25 Äâ 10ââ5 h2 has been determined. the velocity v and the convection coefficient h have units of m/s and w/m2 ââšâŚ k, respectively. in an application involving air at a temperature of t⪠= 25â°c, the surface temperature of the anemometer is maintained at ts = 75â°c with a voltage drop of 5 v and an electric current of 0.1 a. what is the velocity of the air?
Answers: 1
How fast is a ball going when it hits the ground after being dropped from a
height of 9 m? The acce...
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